Critical scattering of laser light by fluid films and interfaces [electronic resource].

Published:: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1979.
Physical Description:: Pages: 16 : digital, PDF file
Additional Creators:: United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Analysis of results of coexistence curve measurements for films of a 2,6-lutidine + water critical mixture, has resulted in the first general confirmation of the scaling theory description of Ising class fluid film critical behavior. For example, we have shown that (3,1) to (2,1) universality class transitions occur in these films as a result of finite size constraints upon the evolution of the correlation length, xi. There exists a generalized law of corresponding states for films. The critical temperature-shift exponent and the crossover temperature critical exponent agree with the values predicted by scaling theory. The 2D regime coexistence curve amplitude dependence upon film thickness is consistent with scaling theory. There exists an unanticipated interaction between the fluid films and the interferometer mirrors in contact with them. This is manifested in a uniform, film thickness dependent, displacement of the entire coexistence curve structure in temperature. We have completed construction of an ellipsometer to be used in studies of the interface between a solid surface and a critical fluid. In addition, we have assembled, and are currently evaluating, a system for studying the intensity autocorrelation of light scattered from critical fluid films. Progress has been made toward developing mathematical techniques for analyzing nonexponential correlation functions in terms of expansions in orthogonal polynomials.

Report Numbers:

E 1.99:coo-2203-7-t1
coo-2203-7-t1

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Published through SciTech Connect.
10/01/1979.
"coo-2203-7-t1"
O'Sullivan, W.; Mockler, R.C.
Colorado Univ., Boulder (USA)

Funding Information:

EY-76-S-02-2203

View MARC record | catkey: 13807639